linux-kernel - Re: linux-next: Tree for Aug 20 (Wno-alloc-size-larger-than)

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Date:   Tue, 24 Aug 2021 18:59:30 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Stephen Rothwell <sfr@...b.auug.org.au>
Cc:     Randy Dunlap <rdunlap@...radead.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Nathan Chancellor <nathan@...nel.org>
Subject: Re: linux-next: Tree for Aug 20 (Wno-alloc-size-larger-than)

On Tue, Aug 24, 2021 at 11:58:59AM +1000, Stephen Rothwell wrote:
> Hi Randy,
> 
> On Mon, 23 Aug 2021 18:24:44 -0700 Randy Dunlap <rdunlap@...radead.org> wrote:
> >
> > This is just weird. What I am seeing is that for every source file
> > where gcc emits a warning: it then follows that up with this
> > >> cc1: warning: unrecognized command line option '-Wno-alloc-size-larger-than'  
> 
> I see the same, as well as:
> 
> <stdin>:1515:2: warning: #warning syscall clone3 not implemented [-Wcpp]
> cc1: warning: unrecognized command line option '-Wno-alloc-size-larger-than'
> 
> But only on my gcc 7.3.1 builds (the rest are gcc 10).
> 
> > Smells like a gcc bug to me.
> 
> Yes
> 
> Also noted here: https://github.com/DynamoRIO/drmemory/issues/2099 (second comment)

Wow, this is really weird. Okay, thanks for the pointers. I'll keep
investigating. I may need to version-limit the use of __alloc_size,
though I'd rather not. We've been able to depend on has_builtin() nicely
for a while now. :P

-- 
Kees Cook